Method for the production of ABS compositions having an improved surface

US9976029B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Hans-Juergen Thiem · Dormagen, DE
• Ingmar Hermsdorfer · Krefeld, DE
• Birgit Mannel · Mülheim an der Ruhr, DE
• Andreas Seidel · Dormagen, DE
• Eckhard Wenz · Neunburg vorm Wald, DE
• Hans-Juergen Klankers · Leverkusen, DE

Key dates

• Filing date: Feb 5, 2014
• Grant date: May 22, 2018
• Expiry date: Jul 1, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2207/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing compositions containing vinylaromatic copolymers which are obtained in an emulsion polymerization process and comprise production-related salt inclusions. Said compositions are characterized by an improved surface quality once the extruded polymer, before being granulated, or the granulate, after being granulated, has been moistened by bringing the polymer in contact with liquid water in a water bath, a tube system filled with water, or a dipping tank, thus making the compositions suitable for producing molded articles having a class A surface that remains flawless over time.